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Technetium (Tc)
Atomic number 43 · transition
| Atomic number | 43 |
|---|---|
| Atomic mass | 97.90721 u |
| Molar mass | 97.90721 g/mol |
| Category | transition |
| Group / period / block | 7 / 5 / d |
| Electron configuration | [Kr] 4d5 5s2 |
| Electrons per shell | 2, 8, 18, 13, 2 |
| Electronegativity (Pauling) | 2.1 |
| Atomic radius | 135.0 pm |
| Density | 11.0 g/cm³ |
| First ionisation energy | 7.1194 eV |
| Melting point | 2430.15 K (2157.00 °C) |
| Boiling point | 4535.15 K (4262.00 °C) |
| Common oxidation states | +4, +7 |
Uses
Medical imaging — the first synthetic element
Discovery
1937, Carlo Perrier, Émillo Segrè